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Miscarriage long time back and period changes can only be related if there was injury or affect to the endometrium basal layer, which if affected will result in thinner endometrial formation and less bleeding during your periods. There could be other hormonal reasons as well for less bleeding during periods. Hormonal levels analysis and examination will help to find out if any other underlying causes are present. Visit a gynecologist for further examination and investigations.
Take care.

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